Dental appliance



H. P. RAWSON.

DENTAL APPLIANCE.

APPucATloN FILED nE,c.26 1918.,

mmewuly wm.

HARRY l. BJWSON, 0F MINNEAPOLIS, MINNESOTA.

:DENTAL hermanos.

isaaaae,

, with the customary fountain spittoon located at a dentists chair so asto catch and collect particles of gold and silver which go into thespittoon when the patient expectorates. rlhese particles are washed outof the spittoon by a stream of water and are at present lost on accountof going down the waste pipe.

Theobject of my invention therefore is to provide a collection chamberfor these particles from which they may be removed from time to time andsaved for future use.

'lhe full objects and advantages 1 of my invention will appear inconnection with the detailed description thereof and the novel featuresembodied in my inventive idea will be particularly pointed out in theclaim.

Referring to the accompanying drawings, which illustrate the applicationof ymy invention in one form,-

Figure 1 is a view mostly in vertical central section. Fig. 2 is ahorizontal section on the line 2f-2 of Fig. Fig. 3 is a plan view partlybroken away of a sealing device for the plugs with which my device isprovided. o

Referring to the particular construction shown in the drawings, the trapcomprises a casing 10 provided with an inlet pipe 12 and an outlet pipe14. rlhe inlet pipe is connected to the casing by a horizontal por tionand after entering the casing is curved downwardly and then inwardly orlaterally, so that the discharge end 16 is directed substantiallyhorizontally toward the opposite wall of the casing, this end beingpositioned some distance above the bottom ofthe casing.

. o rlhe outlet pipe has a receiving end 18 which is directedsubstantially horizontally, and

this pipe then curves downwardly and outwardlyso as to extendhorizontally through the wall of the casing and is then curveddownwardly with the end thereof provided with a coupling 20 forconnecting it to a waste pipe 22. The inner end 16 of the pipe 12 is solocated and directed that the bottom Specication of Letters Patent.

"inalterata aan e, mao.

application filed nebenher es, 191e. serial] na esteso.

portion of the chamber in the casing 10 acts asa settling or collectionchamber. rlhe outer endof the pipe 12 is provided with a coupling`21lfor connecting it to a tube 26 which leads from the customary spittoonat the dentists chair. rlhe bottom and the top of the casing 10 areclosed by similar screw plugs 28 having flanges 30 between which theplug is of angular formation in order that it may be turned by a wrench.In order that the plugs may not be removed by unauthorized persons ametal band 32 is placed around the angular portion between the flanges80, the ends of the band being brought together and secured between lugs34 which areprovided with holes. A wire 36 is passed through these holesand through holes in the ends of the band 32, and the ends of the wireare secured by a lead seal Small plugs 40 and Z12 are screwed intoscrew-threaded openings in the pipes 12 and 11i, respectively. rlheseopenings are so located in the pipes that upon removal of the plugs, awire may be readily inserted for cleaning the pipes in case they becomeclogged.

rl`he operation and advantages of my invention will be obvious from theforegoing description. Particles of gold or silver which get into thespittoon are carried by the stream of water into the casing. Un accountof the particular construction of the casing and the pipes, theparticles settle and collect in the bottom of the casing, which acts asa settling chamber. The stream of water entering the casing instead ofbeing directed toward the bottom thereof is instead directed across thecasing at some distance above the bottom, and hence the heavy particlesare given an opportunity to settle by gravity and will not be carried bythe force of the stream to the entrance of the outlet pipe. rllheseparticles may be removed from time to time by authorized persons uponbreaking the seal and removing the plug at the bottom of the casing. Atthis time the top plug may also be removed and water introduced forwashing out the casing.` rThe provision of the seals both for the topand bottom plugs insures against the extraction of material by allunauthorized persons. rlhe location of the small plugs 4:0 and 4:2 issuch that removal of y material through the openings which they closeisso diilicult as not to be practical, and hence it is not necessary thatthese small plugs be proteotedby seals. The casing 10 also serves as atrap to prevent escape of 'gases therethrough'from the waste pipe.

y I claim:

A dental appliance comprising a vertically extending casing, a pipeadapted to be connected withv a fountain spittoon located ata dentistschair and leading through the upper portion of the side Wall of saideastween the top and bottom of said casing to provide a settling chamberfor retaining particles of dental fillings in the lower portion of saidcasing, and an outlet pipe leading from the top of said casing, saidoutlet pipe being curved downwardly within said casing and outwardlythrough the side wall thereof and then being curved downwardly outsideof and adjacent said side wall for attachment to a waste pipe.

In testimony whereof I hereunto allix my signature.

HARRY P. RAWSON.

